ETRA SBC/Interfaces and Connectors/LCD
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Contents
LCD interface[edit | edit source]
Description[edit | edit source]
The LCD interface available on the Evaluation Kit at the connector J13.
J13 si a 40-pin, 0.5mm pitch, ZIF connector that provides the following signals:
- 18-bit RGB interface
- DE and CLK control signals
- 3.3V power for logic
- 5V power for backlight
- PWM for backlight
Signals[edit | edit source]
The following table describes the interface signals:
| Pin# | SOM Pin# | Pin name | Pin function | Pin Notes |
|---|---|---|---|---|
| 1,2,10,11,12,16,20,24,28,32,36,37,39,40 | - | GND | Ground | |
| 3 | J18.46 | LCD_PWM | PWM for backlight | |
| 4,5,6 | - | LCD_5V | 5V for LED | this rail is enabled by the CPU via GPIO |
| 7,8 | - | LCD_VDD | 3.3V for logic | this rail is enabled by the CPU via GPIO |
| 9 | J18.124 | LCD_DE | LCD_DATA_ENABLE | |
| 13 | J18.144 | LCD_B7 | LCD_B7 (MSB) | |
| 14 | J18.142 | LCD_B6 | LCD_B6 | |
| 15 | J18.140 | LCD_B5 | LCD_B5 | |
| 17 | J18.138 | LCD_B4 | LCD_B4 | |
| 18 | J18.136 | LCD_B3 | LCD_B3 | |
| 19 | J18.134 | LCD_B2 | LCD_B2 (LSB) | |
| 21 | J18.158 | LCD_G7 | LCD_G7 (MSB) | the use of this pin prevents the use of eMMC with 8bit bus |
| 22 | J18.156 | LCD_G6 | LCD_G6 | |
| 23 | J18.154 | LCD_G5 | LCD_G5 | |
| 25 | J18.152 | LCD_G4 | LCD_G4 | |
| 26 | J18.150 | LCD_G3 | LCD_G3 | |
| 27 | J18.148 | LCD_G2 | LCD_G2 (LSB) | |
| 29 | J18.172 | LCD_R7 | LCD_R7 (MSB) | |
| 30 | J18.170 | LCD_R6 | LCD_R6 | |
| 31 | J18.168 | LCD_R5 | LCD_R5 | |
| 33 | J18.166 | LCD_R4 | LCD_R4 | |
| 34 | J18.162 | LCD_R3 | LCD_R3 | |
| 35 | J18.160 | LCD_R2 | LCD_R2 (LSB) | |
| 38 | J18.132 | LCD_CLK | LCD_CLOCK |
Device mapping[edit | edit source]
LCD is mapped to /dev/fb0 device in linux.
Device usage[edit | edit source]
The connector is pinout compatible with the Ampire AM-800480BTMQW-TBMH-A display.
WARNING: the use of the LCD peripheral prevents the use of the eMMC on board of the ETRA SOM as 8bit bus, only 4bit bus is available.
The periperal can be accessed by various linux packages as fbi (for simple image display), or more complex libraries as QT or gstreamer.
Alternate connector[edit | edit source]
The ETRA SBC provides a secondary LCD connector (not mounted by default) for the use of 24bit LCD interface.
Description[edit | edit source]
The 24-bit LCD interface can be available for the Evaluation Kit at the connector J14. For the use of this interface please send an e-mail to helpdesk@dave.eu
J14 si a 40-pin, 0.5mm pitch, ZIF connector that provides the following signals:
- 24-bit RGB interface
- DE, CLK, HSYNC and VSYNC control signals
- 3.3V power for logic
- 5V power for backlight
- PWM for backlight
- two GPIO signals for panel configuration
Signals[edit | edit source]
The following table describes the interface signals:
| Pin# | SOM Pin# | Pin name | Pin function | Pin Notes |
|---|---|---|---|---|
| 9,18,27,36,40 | - | GND | Ground | |
| 1,2 | - | LCD_5V | 5V for LED | this rail is enabled by the CPU via GPIO |
| 3 | J18.46 | LCD_PWM | PWM for backlight | |
| 4 | J18.58 | LCD_5V_EN | LCD_5V power enable | can be used as GPIO if the 5V power switch is bypassed |
| 5.6 | - | LCD_VDD | 3.3V for logic | this rail is enabled by the CPU via GPIO |
| 7 | - | LCD_DISP | pull-down (default) | can be statically configured with pull-up or pull-down |
| 8 | J18.124 | LCD_DE | LCD_DATA_ENABLE | |
| 10 | J18.144 | LCD_B7 | LCD_B7 (MSB) | |
| 11 | J18.142 | LCD_B6 | LCD_B6 | |
| 12 | J18.140 | LCD_B5 | LCD_B5 | |
| 13 | J18.138 | LCD_B4 | LCD_B4 | |
| 14 | J18.136 | LCD_B3 | LCD_B3 | |
| 15 | J18.134 | LCD_B2 | LCD_B2 | |
| 16 | J18.176 | LCD_B1 | LCD_B1 | |
| 17 | J18.174 | LCD_B0 | LCD_B0 (LSB) | the use of this pin prevents the use of eMMC with 8bit bus |
| 19 | J18.158 | LCD_G7 | LCD_G7 (MSB) | the use of this pin prevents the use of eMMC with 8bit bus |
| 20 | J18.156 | LCD_G6 | LCD_G6 | |
| 21 | J18.154 | LCD_G5 | LCD_G5 | |
| 22 | J18.152 | LCD_G4 | LCD_G4 | |
| 23 | J18.150 | LCD_G3 | LCD_G3 | |
| 24 | J18.148 | LCD_G2 | LCD_G2 | |
| 25 | J18.180 | LCD_G1 | LCD_G1 | the use of this pin prevents the use of uSD with 4bit bus |
| 26 | J18.178 | LCD_G0 | LCD_G0 (LSB) | |
| 28 | J18.172 | LCD_R7 | LCD_R7 (MSB) | |
| 29 | J18.170 | LCD_R6 | LCD_R6 | |
| 30 | J18.168 | LCD_R5 | LCD_R5 | |
| 31 | J18.166 | LCD_R4 | LCD_R4 | |
| 32 | J18.162 | LCD_R3 | LCD_R3 | |
| 33 | J18.160 | LCD_R2 | LCD_R2 | |
| 34 | J18.184 | LCD_R1 | LCD_R1 | the use of this pin prevents the use of eMMC with 8bit bus |
| 35 | J18.182 | LCD_R0 | LCD_R0 (LSB) | |
| 37 | J18.130 | LCD_HSYNC | LCD_HORIZONTAL_SYNC | the use of this pin prevents the use of eMMC with 8bit bus |
| 38 | J18.132 | LCD_CLK | LCD_CLOCK | |
| 39 | J18.128 | LCD_VSYNC | LCD_VERTICAL_SYNC |
Device usage[edit | edit source]
WARNING: the use of the 24bit LCD peripheral prevents the use of the eMMC on board of the ETRA SOM as 8bit bus, only 4bit bus is available. It also prevents the use of uSD device as 4bit bus, only 1bit bus is available.
